| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 589 | Geoffrey Kiprotich |  KEN | 46.23 Q PB | 0.216 | 
| 2 | 899 | Wilbert LONDON |  USA | 47.23 Q | 0.225 | 
| 3 | 191 | Musa ISAH |  BRN | 47.39 Q | 0.187 | 
| 4 | 606 | Ilhwan Mo |  KOR | 47.82 | 0.146 | 
| 5 | 756 | Mihai Cristian PÃŽSLARU |  ROU | 48.01 | 0.170 | 
| 6 | 317 | Gezahegn Ababu |  ETH | 49.54 | 0.177 | 
| 671 | Samson Oghenewegba NATHANIEL |  NGR | DNS | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 541 | Christopher TAYLOR |  JAM | 46.73 Q | 0.386 | 
| 2 | 571 | Kazuki Matsukiyo |  JPN | 46.78 Q | 0.205 | 
| 3 | 236 | Anthony José ZAMBRANO |  COL | 47.18 Q | 0.169 | 
| 4 | 715 | Tymoteusz ZIMNY |  POL | 47.20 q | 0.157 | 
| 5 | 492 | Taha Hussein YASEEN |  IRQ | 47.31 q | 0.179 | 
| 6 | 658 | Jochem DOBBER |  NED | 47.67 q | 0.167 | 
| 7 | 812 | Vitsanu Phosri |  THA | 49.30 SB | 0.200 | 
| 8 | 784 | Alessandro Gasperoni |  SMR | 50.48 | 0.227 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 171 | Baboloki THEBE |  BOT | 46.25 Q | 0.190 | 
| 2 | 265 | Luis Charles |  DOM | 47.09 Q | 0.164 | 
| 3 | 570 | Naoki Kitadani |  JPN | 47.32 Q | 0.212 | 
| 4 | 517 | Brayan LOPEZ |  ITA | 47.92 | 0.154 | 
| 5 | 146 | Kinard Rolle |  BAH | 48.60 | 0.149 | 
| 708 | Dawid Kapala |  POL | DNF | 0.179 | |
| 318 | Gemechu Alemu |  ETH | DNS | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 748 | Abdalelah Haroun |  QAT | 46.51 Q | 0.235 | 
| 2 | 531 | Sean BAILEY |  JAM | 46.83 Q | 0.169 | 
| 3 | 365 | Cameron CHALMERS |  GBR | 46.91 Q | 0.196 | 
| 4 | 197 | Nathan Friginette |  CAN | 47.91 | 0.174 | 
| 5 | 141 | Henri Delauze |  BAH | 48.15 | 0.207 | 
| 6 | 826 | Kashief KING |  TTO | 50.06 | 0.194 | 
| 670 | Ojo Sunday Fatoyinbo |  NGR | DNS | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 904 | Kahmari MONTGOMERY |  USA | 46.46 Q | 0.203 | 
| 2 | 193 | Myles Banfield |  CAN | 46.77 Q PB | 0.176 | 
| 3 | 223 | Yu Ang WU |  CHN | 47.65 Q | 0.197 | 
| 4 | 767 | Derrick MOKALENG |  RSA | 48.04 | 0.164 | 
| 5 | 130 | Lawson Power |  AUS | 48.36 | 0.149 | 
| 6 | 790 | Charles DEVANTAY |  SUI | 48.42 | 0.156 | 
| 614 | Abdallah Djimet Souleyman |  KSA | DNS | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 173 | Karabo SIBANDA |  BOT | 46.34 Q | 0.184 | 
| 2 | 208 | Jamal Walton |  CAY | 46.83 Q | 0.145 | 
| 3 | 654 | Iván Núñez |  MEX | 46.96 Q | 0.145 | 
| 4 | 588 | Edwin Ngeeti |  KEN | 47.11 q | 0.223 | 
| 5 | 499 | Vladimir ACETI |  ITA | 47.62 q | 0.187 | 
| 6 | 237 | David Å alamon |  CRO | 47.79 q | 0.172 | 
| 7 | 827 | Joshua St.Clair |  TTO | 48.39 | 0.193 | 
| 8 | 807 | Andile Lusenga |  SWZ | 48.67 PB | 0.241 |